Optimize entity-entity collision (#6587)

* Add IrrLicht type aliases
* Add hash for IrrLicht vector
* Add object map

build/android/jni/Android.mk

@@ -221,6 +221,7 @@ LOCAL_SRC_FILES := \
 		jni/src/rollback_interface.cpp            \
 		jni/src/serialization.cpp                 \
 		jni/src/server/mods.cpp                   \
+		jni/src/server/serveractiveobjectmap.cpp  \
 		jni/src/server.cpp                        \
 		jni/src/serverenvironment.cpp             \
 		jni/src/serverlist.cpp                    \